class X {
	Y b = new Y();
	X() {
		System.out.print("X");
	}
}
class Y {
	Y() {
		System.out.print("Y");
	}
}
public class Z extends X {
	Y y = new Y();
	Z() {
		System.out.print("Z");
	}
	public static void main(String[] args) {
		new Z(); 
	}
}
